Bug#1132015: split jupyter-labextension to a separate package ?

[Jörg-Volker Peetz]

To split off the jupyter-labextension would be good since the package 
jupyter-notebook starting with version 7 now depends on juypterlab (see #1131929).
Therefore, I support this wish.
Please ask if I could be of help here?
Regards,
Jörg.